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u in (-oo:+oo)
(3/4)*u+1/2 = 7/8 // - 7/8
(3/4)*u+1/2-(7/8) = 0
(3/4)*u+1/2-7/8 = 0
3/4*u-3/8 = 0 // + 3/8
3/4*u = 3/8 // : 3/4
u = 3/8/3/4
u = 1/2
u = 1/2
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